@article{EMJ_2015_6_2_a2,
     author = {E. N. Lomakina},
     title = {On estimates of the approximation numbers of the {Hardy} operator},
     journal = {Eurasian mathematical journal},
     pages = {41--62},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2015_6_2_a2/}
}